Functional Responses of known impactful invasive non-native species (NNS) are often higher when compared to those of native or non-invasive NNS trophic analogues, as shown for aquatic snails: the invasive NNS Pomacea canaliculata, the non-invasive NNS Planorbarius corneus, and the native Bellamya aeruginosa feeding on four locally occurring plant species in China. Reproduced from Xu et al. (2016).